This unit is a 2-3 week long unit but the culminating event spans to about 6-20 weeks out. There is a substitute lesson that can take place of the culminating event if you don't have that much time left in the school year. Everything about this lesson is HANDS ON, no reading through text books or watching brainpops, it is real hands on, life experiences for students to learn how plants work and better yet, how they can be successful in growing them. You, the teacher, does not TEACH them how to be successful they figure it out on their own. This is very inquiry based and open ended to what they learn.